One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18)(19,26)(20,22)(21,23)(24,30)(25,29)(27,32)(28,31) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,10)(11,13)(12,15)(14,16)(18,22)(23,25)(24,31)(26,32) involution — undirected(10,13)(11,16)(14,15)(18,23)(21,29)(22,25)(24,32)(26,31)(28,30) involution — undirected(2,6)(3,8)(17,19,20,27)(18,24,22,31)(21,30,29,28)(23,32,25,26)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.